I've seen similar behavior on my system which is an -ati dual-head
setup. I have a suspicion it's not X but rather something in power
management.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Triaged
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screen turns off and on during normal activity
https://bugs.launchpad.net/bugs/401375
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